Submission #199837

#	Time	Username	Problem	Language	Result	Execution time	Memory
199837		Mercenary	Miners (IOI07_miners)	C++14	43 / 100	61 ms	13176 KiB

miners

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef tree <int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int maxn = 2e5 + 5;
int n;
string s;
int dp[maxn][16];
int tmp[2];
int cnt[2][3];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    cin >> n >> s;
    for(int i = 0 ; i < n ; ++i){
        if(s[i] == 'M')s[i] = 0;
        else if(s[i] == 'F')s[i] = 1;
        else s[i] = 2;
    }
    memset(dp,-123,sizeof dp);
    dp[0][0] = 0;
    for(int i = 0 ; i < n ; ++i){
        for(int j = 0 ; j < 16 ; ++j){
            if(dp[i][j] >= 0){
                memset(tmp,0,sizeof tmp);memset(cnt,0,sizeof cnt);
                for(int t = 0 ; t <= 3; ++t){
                    bool cur = (j & (1 << t));
                    if(tmp[cur]++ < 2 && i - 1 - t >= 0)cnt[cur][s[i - 1 - t]]++;
                }
                int cal[2] = {0,0};
                cnt[0][s[i]]++;cnt[1][s[i]]++;
                for(int t = 0 ; t < 3 ; ++t){
                    if(cnt[0][t])cal[0]++;
                    if(cnt[1][t])cal[1]++;
                }
                for(int t = 0 ; t < 2 ; ++t){
                    dp[i + 1][(j << 1 | t) & 15] = max(dp[i + 1][(j << 1 | t) & 15] , dp[i][j] + cal[t]);
                }
            }
        }
    }
    cout << *max_element(dp[n],dp[n]+16);
}

Compilation message (stderr)

miners.cpp: In function 'int main()':
miners.cpp:46:78: warning: array subscript has type 'char' [-Wchar-subscripts]
                     if(tmp[cur]++ < 2 && i - 1 - t >= 0)cnt[cur][s[i - 1 - t]]++;
                                                                              ^
miners.cpp:49:28: warning: array subscript has type 'char' [-Wchar-subscripts]
                 cnt[0][s[i]]++;cnt[1][s[i]]++;
                            ^
miners.cpp:49:43: warning: array subscript has type 'char' [-Wchar-subscripts]
                 cnt[0][s[i]]++;cnt[1][s[i]]++;
                                           ^
miners.cpp:29:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
miners.cpp:30:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 0 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 0 / 8
• Subtask 8: 0 / 8
• Subtask 9: 0 / 8
• Subtask 10: 0 / 8
• Subtask 11: 0 / 8
• Subtask 12: 0 / 8